To determine the three drugs without separation in an anticol cough syrup,lodeine phasphate,ephedrine hyrochlor and charphe niramine maleate were analyzed by multi wave length linear regression.

• 采用多波长直线回归分光光度法,不经提取分离,直接测定联邦止咳露中磷酸可待因、盐酸麻黄碱和扑尔敏3种组分的含量。